Here are a few interesting resources for Differentiating Instruction. Please add to the list as you find others:

11 Practical Ways to Guide Teachers Toward Differentiation by Carolyn Chapman and Rita King
http://www.cpco.on.ca/Learningto18/resources/11ways.pdf

Anchor Activities
http://www.montgomeryschoolsmd.org/curriculum/enriched/giftedprograms/docs/**anchor**.ppt

Anchor Activities Allow Teachers to Work with Small Groups by Adam Waxler
http://ezinearticles.com/?Anchor-Activities-Allow-Teachers-to-Work-With-Small-Groups&id=1968604

Best Practices: Instructional Strategies and Techniques
http://www.saskschools.ca/curr_content/bestpractice/tiered/index.htm

Breaking News English
http://www.breakingnewsenglish.com/

Busting Myths about Differentiated Instruction by Rick Wormeli
http://www.wilmette39.org/DI39/dipdf/BustingMythsaboutDI.pdf

Myths and Misconceptions about English Language Learners
http://www.cal.org/resources/Digest/myths.html

Dare to Differentiate wiki: http://daretodifferentiate.wikispaces.com